Battery unit



FIG. 1 is a front elevational view of a battery unit showing our new design;

FIG. 2 is a rear elevational view thereof;

FIG. 3 is a left side elevational view thereof, the right side elevational view being a mirror image;

FIG. 4 is a top plan view thereof;

FIG. 5 is a bottom plan view thereof; and,

FIG. 6 is a top, front, right side perspective view thereof.

The broken line showings in the drawings are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a battery unit, as shown and described. 